I had a thought while reading the other's suggestions...
*You could use a microwave save casserole dish, line it with something like parchment paper (or even coat it with butter)
*spread out something like "Golden Grahams" cereal (someone said something about the chocolate covered graham crackers!) or even partly broken up pieces of a sugar cone
*sprinkle with lots of miniature marshmallows, and whatever else you eant - pecans, almond slivers, toasted coconut, etc. (perhaps even toast the nuts before adding them to the mix)
At this point, you could heat that in the microwave or in the oven for just a little bit and then drizzle chocolate syrup over it (unless you used chocolate covered graham crackers or cookies)
OR
Before you heat it up, add some chocolate chips or roughly chopped up miniature reese's peanut butter cups.
After it's heated just enough to make it a little gooey, then serve it up on paper plates. (and make sure you've put bibs on the kids!)